User Guide

RH-21 Company Confidential
System Module Nokia Customer Care
Page 36  2004 Nokia Corporation. Issue 2 07/2004
Baseband External Connections
RIP
Signal
name
Connected from
- to
Sys Conn
I/O
Signal Properties
A/D Levels-Freq./
Timing resolution
Description / Notes
System Connector HP Internal microphone IF between System Connector and Mic/Ear circuitry
XMICP HS/HF
Mic
Audio
- UEM
In
Out
Ana
Bias
100mV
nom
diff
2.1V
bias, 1K
ohm
Audio
DC bias
Differential symmetric output.
Accessory detection by bias
loadind.
Hook interrupt by heavy bias
loading..
XMICN In Ana 100mV
nom
diff ;
2.1V
bias
1kohm
Audio
XEARP HS/HF
EAR/
Amp.
Audio
-UEM
In Ana 100mV
nom
diff
Audio Quasi differential DC-coupled
earpiece/HF amplifier signal to
accessory. DC biased to 0.8V;
XEARN a quiet reference
although have signal when
loaded due to internal series
resistor.
XEARN
INT Switch Audio
- UEM
In Dig 0/2.7V HS interrupt from system con-
nector switch when plug
inserted
CHARGER INTERFACE
CHARGER lines, no bus *
VCHARIN Charger UEM In Vch
r
< 16V
<1.2A
DC Vch from Charger Connector,
max 20V
GND GN
D
GND from/to Charger connec-
tor
CHRGCTRL Input Out-
put
32Hz,
0/2.8V
PWM control line for 3-wire
chargers